摘要
流体热力学性质的计算是化工热力学中的一类重要计算,立方型方程经常用于这类计算中。SRK方程与PR方程是在RK方程基础上发展而来的,具有比RK方程更好的计算精度。但现有教材中没有给出PR方程和SRK方程的剩余焓、剩余熵的计算公式,缺失了流体热力学性质计算的系统性。本文通过立方型状态方程的一般形式推导出PR方程和SRK方程的剩余焓、剩余熵的计算公式,利用Excel电子表格计算双组分混合气体的热力学性质。计算过程简捷明了,利于学生更好地理解混合物热力学性质的计算过程。
The calculations of thermodynamic properties of fluids are important calculations in Chemical Engineering Thermodynamics. The cubic equations of state are frequently used for such calculations. SRK equation and PR equation are developed based on RK equations and can get a better accuracy. But in present textbooks, there is no description on the calculation of residual enthalpy and residual entropy with PR equation and SRK equation, resulting in the incompleteness in the calculation methodology. In this paper, we derive residual enthalpy and residual entropy calculation formula of PR equation and SRK equation based on the generalized cubic equation of state. With Microsoft Excel spread sheet, thermody- namic properties of a binary gaseous mixture are calculated. The use of Microsoft Excel enables the calcu- lation process simple and intuitive, and helps students better in understanding the calculation procedures.
出处
《化工高等教育》
2013年第1期59-62,80,共5页
Higher Education in Chemical Engineering
基金
大连理工大学教改基金资助
项目编号:ZD201206
关键词
化工热力学
流体热力学性质
气体混合物
SRK方程
PR方程
EXCEL
Chemical engineering thermodynamic
Thermodynamic properties
Binary gas mixtures
P R e- quation
SRK equation
Microsoft Excel
